Hydraulic elevator



(No Model.)

G. W. BALDWN.

HYDRAULIC BLEVATOR.

Patented Nov. l1, 1884.

rath@ artnr tribu.

CYRUS V. BALDWIN, OF CHICAGO, ILLINOIS.

HYDRAULIC ELEVATO R.

fo all whom it may concern:

Be it known that I, GYnUs W. BALDWIN, a citizen of the United States, and a resident of Chicago, in the county or" Cook and State of Illinois, have invented certain new and useful Improvements in Hydraulic Elevators, of which the following is a specification.

My invention relates to that class of elevators in which a piston is moved in a cylinder under the action of acolumn of water; and my invention consists in means, fully described hereinafter, whereby to prevent the accumulation of air in the space below the piston.

In the drawings, Figure l is an elevation in part section of sufficient oi a Hale elevator to illustrate my improvement. Fig. 2 is a plan view of the piston enlarged. Fig. 3 is a section of a valve attachment.

The piston A is of any suitable construction, and is connected to the rod or rods a, and reciprocates in the cylinder B under the pressure of water, or when the latter is circulated, in a manner too well known to those skilled in the art to require specific description.

As is well known, it is not uncommon for air to collect in the space beneath the piston of a hydraulic elevator, with injurious effects upon the operation of the machine. To prevent this, openings have been made in the piston, and the latter has been provided with valves; but the constructions heretofore adopted have sometimes proved objectionable in consequence of the failure of the valves to operate,or theirliabilityto become firmly seated. I remedy these defects by providing the piston with one or more vertical openings, i, terminating each in an annular seat, m, adapted to a disk-valve, D, the seat or the valve being provided with a packing, e. The valve D is tent No. 307,740, dated November l1, 1884.

er 12, 1883. (No model.)

so suspended above the seat that it will be 4 :nearly in equilibrium. It may rest lightly upon its seat, but preferably occupies an open position to permit the upward passage of any air from below the piston, but closing at such times as the water-pressure upon the upper 4 side ofthe piston is in excess, so that the valve will close the instant the piston begins its movement.-

A convenient method of counterbalancing the valve consists in providing it with a weight 5 ed arm, f, at one side, and pivoting the latter by a pin, h, between ears gg, the weight of the valve-arm being slightly in excess of that of the disk.

To adapt the device to ready application to 5 any piston, I form the seat x at the top of a hollow nipple, J, threaded to iit the opening in the piston, and carrying the ears g g at one side, as shown in Fig. 3.

XVithout limiting myself to the manner de- 6 scribed of balancing the valve, I claiml. The combination, in a hydraulic elevator, of a piston having an opening, and a disk-valve having a seat at the upper end of said opening, and balanced, substantially as set forth. 6

2. The combination of a piston having a vertical opening, a valve, D, adapted to a seat at the upper end of said opening, and provided with a weighted arm pivoted at one side of said opening, substantially as specified. 7

In testimonywhereof I have signed my name to this specification in the presence of two subscribing witnesses.

CYRUS WV. BALDWIN.

Witnesses H. L. Gannison, L. HARVEY CRrsrInLD. 

